The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 28, 1997
Filed:
Jun. 24, 1994
Zhicheng Hu, Edison, NJ (US);
Chung-Zong Wan, Somerset, NJ (US);
Yiu-Kwan Lui, Parlin, NJ (US);
Joseph C Dettling, Howell, NJ (US);
Engelhard Corporation, Iselin, NJ (US);
Abstract
The present invention relates to a layered catalyst composite of the type generally referred to as a three-way conversion catalyst having the capability of substantially simultaneously catalyzing the oxidation of hydrocarbons and carbon monoxide and the reduction of nitrogen oxides. The structure of the layered catalyst composite of the present invention is designed wherein there is a first layer and a second layer. The first layer comprises a first support; at least one first palladium component and an oxygen storage component in intimate contact with the palladium component; optionally another first platinum group metal component; a zirconium component; at least one first alkaline earth metal components and at least one first rare earth metal component selected from the group consisting of lanthanum metal components and neodymium metal components. The second layer comprises a second support; at least one second palladium component; optionally another second platinum group metal component; at least one second alkaline earth metal component; at least one second rare earth component selected from the group consisting of lanthanum metal components and neodymium metal components and a zirconium component.